JP2982508B2 - Network management system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a network management system and, more particularly, to a network management system in an optical transmission line network in which an optical transmission line is connected between a plurality of optical signal termination devices (LTMs) via a repeater.

[0002]

2. Description of the Related Art In a conventional network management system, in a communication network as shown in FIG.
When it is desired to transmit the monitoring control information to the TMs 31 and 32 or the repeaters 3a, 3b and 3c, a subnet address representing the subnet 35 is determined, and is transmitted to the subnet address. When the CONT 34 sends the supervisory control information from the information processing section 19 to the supervisory control information transfer network 7 through the NE communication means 16 (see FIG. 8), each LTM constituting the supervisory control information transfer network 7 (see FIG. 7)
Is able to determine the transfer destination of the received packet by guiding it to the communication processing unit 8 from the CONT communication unit 9 and comparing it with the network route information table unit 13. Such an operation of each LTM ultimately realizes packet transfer on an optimal path, which is a function of the supervisory control information transfer network 7. In this way, the monitoring control information sent by the CONT 34 is transferred from the intra-LTM communication means 10 to the subnet 35. CO arriving on subnet 35
The packet from the NT 34 is transferred by the monitoring control information transfer network 7 by a certain algorithm, and is always transmitted to the LTM 31 or the LT
Only one of M32 will be reached first. For example, when a packet addressed to the subnet 35 from the CONT 34 reaches the LTM 31 first,
If a failure occurs between the repeater 3a and the repeater 3b and communication becomes impossible, the communication from the LTM 31 and the CONT 34 becomes impossible. That is, CONT3
No. 4 makes it impossible to monitor and control the repeaters 3b, 3c and LTM32. At this time, LTM3
The contents of the communication state table means 12 are as shown in Table 1.

[0003]

[Table 1]

[0004] LTM31 is an unreachable repeater 3
b, 3c, when receiving a packet to LTM32,
The LTM 31 stores the addresses of a plurality of LTMs through which the packet itself should pass, separately from the destination of the packet to be transmitted.
By writing the read information of the M path information table means 14, the repeater or LTM which is the destination of the packet is written.
The route to reach is specified. In the event of a failure, the LTM and the repeater that have become unreachable can be controlled using such a packet transfer function of the LTM.

[0005]

In such a conventional network management system, between LTMs in a subnet composed of a plurality of repeaters (for example, repeaters 3a and 3b).
If a failure occurs between (1) and (2), only one LTM in the subnet can access a certain repeater.

Normally, a repeater (repeater 3a) capable of communicating with the LTM (for example, LTM31) on the side receiving the monitoring control information from the CONT transmits the monitoring control information from the CONT even after a failure has occurred. Therefore, monitoring control is possible, and the same real-time property as when no failure occurs is obtained.

However, for a repeater (repeaters 3b and 3c) that can communicate only with an LTM (eg, LTM32) facing the LTM, the packet that has reached LTM31 once is transmitted to LTM path information registered in advance by LTM31 itself. Since the packet transfer path is specified using the table means 14, each LTM must determine the transfer destination by referring to the path information area which is a part of the packet overhead which is not referred to in the normal packet transfer. , The packets to the repeaters 3b and 3c that can communicate only with the LTM 32 take more time than normal transfer time. Further, as shown in FIG. 3, after the transfer from the CONT 34 to the LTM 31 (arrow A), the LTM 31
It must be re-transferred to M32 (arrow B), which consumes more time than normal transfer time. Therefore, there is a disadvantage that the real-time property is impaired.

[0008]

SUMMARY OF THE INVENTION A system according to the present invention comprises at least one optical signal termination device for terminating an optical signal connected via a repeater for amplifying an optical signal on an optical transmission line. A network having a subnet, a monitoring control device for monitoring and controlling the repeater and the optical signal termination device, and a monitoring control information transfer network for transferring fault information of the repeater from the optical signal termination device to the monitoring control device In the management system, the optical signal termination device includes first communication means for performing communication with another optical signal termination device and the repeater, and second communication means for performing communication with the monitoring control device. A communication processing unit for performing communication processing of data packets performed through the first communication unit and communication processing of management data performed through the second communication unit; Communication state table means for recording a communication state with the repeater in the first communication means; and a communication processing section for transmitting a data packet from another optical signal termination device in the communication processing section. Network route information table means for registering a route to the subnet, and data for changing its own address when a failure occurs in communication with the repeater managed by the optical signal terminal. The monitoring and control device includes an address table for registering a subnet address representing the subnet, and management data of the plurality of optical signal termination devices. A third communication unit for performing transmission and reception, and the address table unit are held, and processing of management data notified through the third communication unit is performed. And information for changing a subnet address of one of the plurality of optical signal termination devices belonging to the failed subnet when the communication failure is notified from the optical signal termination device. And a secondary address table means for storing.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 to FIG. 3 are block diagrams of a first embodiment of the present invention. The operation when no failure occurs is the same as in the conventional system. Hereinafter, the operation when a failure occurs will be described.

In FIG. 1, repeaters 3a and 3
When a failure occurs between the LTM and the LTM, the LTM 31 and the LTM 32 are notified of the failure, and the communication status table means 12 held by each LTM is updated according to the communication status. For example, the communication status table means 12 held by the LTM 1 is as shown in Table 2.

[0012]

[Table 2]

Next, each LTM changes its own subnet address based on the next host address table means 15. It is assumed that the subnet address of the LTM 31 has not been changed in SUB1, and the subnet address of the LTM 32 has been changed to SUB2. Note that the address used here has a format composed of a network address section, a subnet address section, and an LTM address section.

When the subnet addresses of the two LTMs are changed as described above, the subnet addresses SUB1 originally representing one subnet are changed to SUB1 and SUB.
2 divided into two subnets. After that, SUB
The two subnet addresses 1 and SUB2 behave as if they were two different subnet addresses from the beginning.

When a packet is sent to the repeater 3b after detecting the occurrence of a failure in the CONT 4, the SUB 2 is checked from the own address table means 18 using the SUB 1 of the address table means 17 as a key, and the SUB 1 and SUB 2 Send to the subnet address.
The network route information table means 13 in a plurality of LTMs constituting the supervisory control information transfer network 7 has SUB1,
Information for determining the route of the packet addressed to SUB2 is registered. As a result, the packet LTM1 destined for the subnet of SUB1 and the packet destined for the subnet of SUB2 reach LTM2. Since the LTM1 checks the communication status table means 12 and cannot communicate with the repeater 3b,
Discard the received packet. LTM2 is a repeater 3b
Is transmitted to the repeater 3c. As a result, only a packet via the LTM2 returns a response to the CONT4.

By doing so, the arrival time from the CONT 4 to the final destination is shortened.

FIGS. 4 and 5 are block diagrams of a second embodiment of the present invention. The operation when no failure occurs and the address change function of each LTM when a failure occurs are the same as those in the first embodiment. The difference between the LTM operation and the first embodiment is that the repeater 3a and the repeater 3b in FIG.
LTM1 and LTM2 in FIG. 4 transmit the contents of the communication status table means 12 updated by the occurrence of a failure to the CONT4 when a failure occurs between them. The CONT 4 in FIG. 5 receiving this information records the contents in the communication status management table means 20. L at this time
The communication status table means 12 held by TM1 is as shown in Table 1, and the communication status management table means 20 in CONT4 is as shown in Table 3.

[0018]

[Table 3]

Since it is known that when a packet is sent from the CONT 4 to the repeater 3b after the occurrence of the fault is notified to the CONT 4, it is sufficient to send the packet to either the address SUB or the SUB 2 as in the conventional method. ,
Inspection of the communication status management table means 20 reveals that the repeater 3b belongs to the address SUB2 (Table 3). Therefore, the monitoring control information for the repeater 3b is:
Transmission is made only to SUB2.

As described above, by managing the communication status between the LTM and the repeater in the CONT4, the number of packet transmissions from the CONT4 can be made one, and the packet arrival time can be further increased as compared with the first embodiment. Can be shortened.

[0021]

As described above, according to the present invention, L
Own host address table means for each LTM autonomously changing its own address due to a fault in the TM, and secondary address table means for synchronizing addresses with the LTM's own host address table means in the CONT In the event that a failure occurs such that the subnet is split into two, each of the split components can be treated as a different subnet, and the processing time for packet transfer and the like can be reduced. Thus, there is an effect that the transfer time of the packet can be reduced as a whole.

[Brief description of the drawings]

FIG. 1 is a block diagram of a first embodiment of the present invention.

FIG. 2 is a block diagram of a first embodiment of the present invention.

FIG. 3 is a block diagram of a first embodiment of the present invention.

FIG. 4 is a block diagram of a second embodiment of the present invention.

FIG. 5 is a block diagram of a second embodiment of the present invention.

FIG. 6 is a block diagram of a conventional system.

FIG. 7 is a block diagram of a conventional system.

FIG. 8 is a block diagram of a conventional system.

[Explanation of symbols]

 1, 2 Optical signal terminator (LTM) 3a, 3b, 3c Repeater 4 Monitoring and control unit (CONT) 5 Subnet 7 Monitoring and control information transfer network 8 Communication processing unit 9 Continuity communication unit 10 Communication unit within LTM 11 Repeater monitoring unit 12 Communication status table means 13 network route information table means 14 LTM route information table means 15 own host address table means 16 paired LTM communication means 17 address table means 18 secondary address table means 19 information processing section 20 communication status management table means

Claims (2)

(57) [Claims] At least one subnet having a plurality of optical signal terminating devices for terminating an optical signal connected via a repeater for amplifying an optical signal in an optical transmission line, the repeater and the optical signal termination In a network management system having a monitoring control device that monitors and controls devices and a monitoring control information transfer network for transferring fault information of the repeater from the optical signal termination device to the monitoring control device, the optical signal termination device is A first communication unit for performing communication with another optical signal termination device and the repeater, a second communication unit for performing communication with the monitoring control device,
A communication processing unit for performing communication processing of a data packet performed through the first communication unit and communication processing of management data performed through the second communication unit; Communication status table means for recording the communication status with the repeater, and registering a route to the subnet for use when transferring a data packet from another optical signal termination device in the communication processing unit; Network path information table means for storing, and a host address table for storing data for changing its own address when a failure occurs in communication with the repeater managed by the optical signal terminal. Means, an address table means for registering a subnet address representing the subnet, and a plurality of the optical signal termination devices. A third communication unit for transmitting / receiving management data to / from the information processing unit; an information processing unit for holding the address table unit and processing management data notified through the third communication unit; Secondary address table means for registering data for changing a subnet address of one of the plurality of optical signal termination devices belonging to the failed subnet when a communication failure is notified from the termination device; A network management system comprising: 2. The network management system according to claim 1, wherein said supervisory control device has a communication status management table means for recording a communication status with said repeater and said optical signal termination device.